Coastal Silver-stiletto vs Ze Significant Tooth Crab

Acrosathe annulata compared with Geothelphusa eucrinodonta

Key Differences

• Coastal Silver-stiletto is Least Concern while Ze Significant Tooth Crab is Data Deficient.

Taxonomic Classification

Rank	Coastal Silver-stiletto	Ze Significant Tooth Crab
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Arthropoda (節足動物)	Arthropoda (節足動物)
Class	Insecta (昆虫)	Malacostraca (軟甲綱)
Order	Diptera (ハエ目)	Decapoda (十脚目)
Family	Therevidae	Potamidae
Genus	Acrosathe	Geothelphusa
Species	Acrosathe annulata	Geothelphusa eucrinodonta

Evolutionary Relationship

Coastal Silver-stiletto and Ze Significant Tooth Crab share a common ancestor at the Phylum level: Arthropoda. (節足動物)

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

Ze Significant Tooth Crab

DD — Data Deficient

Physical Characteristics

Attribute	Coastal Silver-stiletto	Ze Significant Tooth Crab
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Coastal Silver-stiletto

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Ze Significant Tooth Crab

Habitat

Typically found in marine, freshwater, and terrestrial environments.

Range

Found in Taiwan.

Coastal Silver-stiletto

Coastal silver stiletto (Acrosathe annulata) is a slender robber fly in the family Therevidae, native to northwestern Europe, including the United Kingdom, France, the Netherlands, Belgium, and Scandinavia. Adults are found on coastal sand dunes and sandy heathland, where they perch on bare sand to ambush small flying insects. Stiletto flies in the family Therevidae are characterised by a slender body, long pointed abdomen, and predatory habits; adults prey on a variety of small dipterans and other flying insects during warm, sunny periods. Larvae develop in sandy soil, where they are also predatory, feeding on other invertebrate larvae. Acrosathe annulata is a habitat specialist restricted to open, sandy coastal habitats with sparse vegetation—environments that have declined substantially across northwestern Europe due to dune stabilisation, recreational disturbance, and the cessation of traditional dune management. The IUCN lists it as Least Concern, though regional conservation bodies in the United Kingdom have flagged population declines. It is considered an indicator of high-quality coastal sand dune habitats and is monitored through national invertebrate surveys.